ASTM A387 Grade 9 Class 2 A387 Grade 9 Class 2 – chrome–molybdenum plate is an ideal material for welded pressure vessels and boilers used in elevated temperature service. With excellent resistance to high temperature and corrosion, this type of steel is commonly used in the petrochemical, oil, gas and power generation industry.

A387-11-2 and SA387-11-2 are killed and thermally treated as requested by ASTM A387 and ASME SA387, both SA387 and A387 are described as "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum".